Customer.io Outage History
Daily status observations, past incidents, and reported issue history for Customer.io.
Checking current status...
90-Day Trend
Monthly Status Summary
| Month | Issue-free days | Days Tracked | Days with Issues |
|---|---|---|---|
| August 2026 | 92% | 25 | 2 |
| July 2026 | 77.4% | 31 | 7 |
| June 2026 | 73.3% | 30 | 8 |
| May 2026 | 80% | 5 | 1 |
This percentage summarizes normalized provider-status observations by calendar day. It is not duration-based, component-weighted, or contractual uptime. See the methodology and limitations.
Daily Status (Last 91 Days)
May 27
Today
Operational
Degraded
Partial Outage
Major Outage
Maintenance
No Data
Incident History
August 2026
Customer.io UI is inaccessible
Started:
monitoring
We are continuing to monitor for any further issues.
monitoring
A fix has been implemented and we are monitoring the results.
investigating
We are currently investigating this issue.
Delays in processing and UI inaccessible for some customers in the US datacentre
Started:
investigating
We are continuing to investigate this issue.
investigating
Our team is currently investigating an issue that is causing some delays in data processing. This impacts a small subset of customers in the US datacentre.
July 2026
Issues accessing EU accounts
Started:
monitoring
A fix has been implemented and we are monitoring the results.
identified
The issue has been identified and a fix is being implemented.
investigating
We are currently investigating an issue impacting access to EU accounts and API access. There is no impact with data processing or data loss.
Some EU users are experiencing delays in processing
Started:
monitoring
A fix has been deployed, and we are recovering any delayed backlogs. We are continuing to monitor the results.
identified
A fix has been implemented and we are monitoring the results. Thanks for your patience and we'll continue to update as we make progress
investigating
Our team is looking into a problem affecting UI slowness and processing delays for some EU customers.
Some customers are experiencing data processing and message-sending delays
Started:
monitoring
A fix has been deployed, and we are processing any delayed backlogs. We are continuing to monitor the results.
identified
The issue has been identified and we're working on a fix. Thank you for your patience.
investigating
Our engineers are currently looking into an issue that is causing data processing and message-sending delays for a small subset of customers in the US region. We apologise for any inconvenience caused.
Delays in message sending
Started:
monitoring
A fix has been implemented and we're monitoring the results.
investigating
Our team is currently investigating an issue delaying message sending in the US and EU regions
Some customers are experiencing data processing delays
Started:
monitoring
A fix has been implemented and we are monitoring the results.
identified
We've identified the cause of the event processing delays and our team is working on a fix. Thank you for your patience and we'll update again as we make progress.
investigating
Our engineers are currently looking into an issue that is causing data processing delays for some customers in our EU region. Thank you for patience and we apologize for the inconvenience.
Delays processing send events in some environments
Started:
monitoring
A fix has been deployed and we are processing through any delay backlogs. We are continuing to monitor but expect delays to reduce shortly.
identified
We're monitoring increased load on our backend that is causing a delay in processing sends. We are actively monitoring the issue and will share updates accordingly.
User Interface is currently unavailable for some users in EU. Data processing delays
Started:
monitoring
Processing is actively recovering. We apologize for the disruption this caused and will continue monitoring until it's fully caught up.
identified
The Customer.io UI is back online. We're continuing to work on system stability to confirm the issue is fully resolved. Processing is recovering but still delayed
investigating
Our team is currently investigating an issue where the Customer.io dashboard (fly.customer.io) is unavailable for some users in EU. We're also looking into potential data processing delays.
User Interface is currently unavailable, data processing delays
Started:
monitoring
The UI is back up and delays are actively recovering. We sincerely apologize for the inconvenience and appreciate your patience.
investigating
Our team is currently investigating an issue where the Customer.io dashboard (fly.customer.io) is unavailable. We're also looking into potential data processing delays.
June 2026
Some customers are currently unable to access the account Billing page in our UI
Started:
monitoring
We've identified the issue and access to the Billing page has been restored. We thank you for your patience!
investigating
We're looking into an issue where https://fly.customer.io/settings/billing/ isn't loading for some customers. We apologize for the inconvenience.
Investigating Connectivity Issues
Started:
monitoring
A fix has been implemented and the systems are recovering.
We are monitoring UI for any other issue.
identified
The team has identified the issue and is actively working on a fix
investigating
We are aware of an issue affecting access to our web application. Customers may encounter ERR_CONNECTION_REFUSED when attempting to access the UI.
At this time, we are not aware of any impact beyond UI accessibility. Message processing and delivery continue to operate normally.
Our team is actively investigating the issue and working to restore full service as quickly as possible.
We will provide updates as more information becomes available.
Delays in processing requests
Started:
investigating
Identified the issue, still processing backlog
investigating
Our team is aware of an issue affecting Customer IO EU and US systems . We are looking into this and gathering more details.
AI Agent and LLM Campaign Actions Disruption
Started:
monitoring
A fix has been implemented and we are monitoring the results.
identified
Our engineers have identified the issue that is causing disruption. We are working on a resolution and will provide an update shortly. Thank you for your patience.
investigating
We are currently investigating an issue affecting our AI Agent and LLM actions within campaigns. Some customers may be experiencing disruption or delays with these features. We will provide an update as soon as we have more information. Thank you for your patience!
Some customers seeing delays setting up Pipelines in new EU workspaces
Started:
monitoring
A fix has been implemented and we are monitoring the results.
investigating
We are currently investigating a delay affecting the setup of Pipelines in newly created workspaces in our EU region. Customers creating new workspaces may experience longer than expected wait times before Pipelines become available.
Our team is actively working on this and we will post another update shortly. Thank you for your patience.
Salesforce and Hubspot syncs might be delayed for some EU customers
Started:
monitoring
We have rolled out a fix and we're monitoring closely.
identified
We've identified an issue affecting some EU customers' Salesforce and Hubspot syncs. Our team is working on a fix.
Customer.io UI is currently inaccessible
Started:
monitoring
We've got a fix in place, and the UI is available once again. Thank you for your patience!
investigating
Our team is aware of this issue and are digging into it right now. We apologize for the inconvenience and will be back with an update as soon as possible.
UI inaccessible
Started:
monitoring
We have rolled out a fix for the remaining UI-related issues and are watching system behavior closely.
identified
Our team has identified additional UI-related issues affecting some customers. We are working on a fix now.
monitoring
A fix has been deployed for the issue affecting access to the UI. We are monitoring performance and customer feedback.
investigating
Our team is aware of an issue affecting access to the Customer.io UI and we are working to identify the cause.
Reverse ETL Syncs not being run for some EU Customers
Started:
monitoring
A fix has been deployed for the issue affecting Reverse ETL syncs in EU workspaces. We are continuing to monitor this.
investigating
We are currently investigating an issue affecting Reverse ETL syncs for some EU customers.
May 2026
Some customers are seeing broadcast delivery delays (emails, push notifications, and webhooks)
Started:
monitoring
We have a resolution in place and are monitoring message throughput recovery now. Thank you for your patience!
identified
We've identified the issue and are working towards a resolution now.
investigating
Our engineers are aware of an issue where messages may be showing as "queued". We're investigating this now. Thank you for your patience!
Customers in the EU region may experience delays in message sending
Started:
monitoring
A fix has been implemented and we are monitoring the results.
investigating
We are currently investigating this issue.
Some customers in our EU region may experience errors and delays
Started:
monitoring
The UI is available as expected, and we are monitoring before marking this as fully resolved. Thank you again for your patience!
identified
Our engineers are looking into an issue where some workspaces aren't loading as expected. Processing and deliveries may be delayed. We're working to get this resolved and will post an update soon. Thank you for your patience!
April 2026
Delay in Salesforce & Hubspot data-in integrations
Started:
monitoring
We have identified the issue, released a fix, and are currently monitoring integrations.
investigating
We are currently investigating an issue impacting Salesforce and Hubspot data-in integrations in the US region.
Customer.io UI is currently unavailable for some customers
Started:
monitoring
The UI is available as expected, and we are monitoring before marking this as fully resolved. Thank you again for your patience!
investigating
Our engineers are looking into an issue where some workspaces aren't loading as expected. We're working to get this resolved and will post an update soon. Thank you for your patience!
Some customers in our EU region may experience errors and delays
Started:
monitoring
A fix has been implemented and we are monitoring the results.
identified
The issue has been identified and a fix is being implemented.
investigating
We are currently investigating this issue.
Integration Destinations UI Disruption
Started:
identified
The issue has been identified in the UI and a fix is being deployed.
investigating
Our team is aware of an issue affecting Integrations with destinations in EU/US. We are looking into this and gathering more details. Data import and export is still working, only the UI is effected.
EU Region API Processing Delays
Started:
investigating
We are continuing to investigate this and will be back again as soon as we have an update. Thank you for your continued patience!
investigating
Some customers in our EU region may be experiencing delays with processing data sent in through our API. Our team is investigating the cause and will provide an update soon. Thank you for your patience!
March 2026
Domain Verification Currently Unavailable
Started:
monitoring
A fix has been implemented and we are monitoring the results.
identified
The issue has been identified and a fix is being implemented.
investigating
Customers are unable to add or edit unverified sending domains.